$ git clone -n https://src.fedoraproject.org/rpms/firecracker.git /var/lib/mock/f38-build-721753-98619/root/chroot_tmpdir/scmroot/firecracker
Cloning into '/var/lib/mock/f38-build-721753-98619/root/chroot_tmpdir/scmroot/firecracker'...
$ git fetch origin 2f122eefffcedcc0ad92e47241a7d206f97c124a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/firecracker
 * [new ref]         2f122eefffcedcc0ad92e47241a7d206f97c124a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2f122ee Update to version 1.3.3